Better images

[jehendeoff]

Here's a list that I want to change

• [x] center the images
• [x] handle multiple images in the folder (slideshow feature)
• [ ] Filter through every known image type (eg. let's not try to open a .odt file)
• [ ] have "animations" when changing images
• [ ] smash all the (image related) TODOs

Bonus

• Optimisations :
  • The resize algorithm is handled by the image crate itself
  • Won't apply the slideshow logic if there is only 1 image